package com.itheima.reggie.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.itheima.reggie.common.CustomException;
import com.itheima.reggie.common.R;
import com.itheima.reggie.mapper.CategoryMapper;
import com.itheima.reggie.pojo.Category;
import com.itheima.reggie.pojo.Dish;
import com.itheima.reggie.pojo.Setmeal;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishService;
import com.itheima.reggie.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {

    @Autowired
    private DishService dishService;
    @Autowired
    private SetmealService setmealService;

    /**
     * 根据ID删除分类，但需要判断
     * @param id
     */
    @Override
    public void remove(Long id) {
        //    添加查询条件，根据分类id进行查询
        //LambdaQueryWrapper<Dish> dishLambdaQueryWrapper = new LambdaQueryWrapper<>();
        //dishLambdaQueryWrapper.eq(Dish::getCategoryId, id);
        QueryWrapper<Dish> dishQueryWrapper=new QueryWrapper<>();
        dishQueryWrapper.eq("category_id",id);
        int count1 = dishService.count(dishQueryWrapper);
        //    查询分类是否关联了菜品，如果已经关联，抛出一个业务异常
        if (count1 > 0) {
            //    已经关联菜品，抛出一个异常
            throw new CustomException("当前分类关联了菜品，不能删除");
            //return R.error("当前分类关联了菜品，不能删除");
        }

        //    同理，查询套餐
        //LambdaQueryWrapper<Setmeal> setmealLambdaQueryWrapper = new LambdaQueryWrapper<>();
        //setmealLambdaQueryWrapper.eq(Setmeal::getCategoryId, id);
        QueryWrapper<Setmeal> setmealQueryWrapper=new QueryWrapper<>();
        setmealQueryWrapper.eq("category_id",id);
        int count2 = setmealService.count(setmealQueryWrapper);

        if (count2 > 0) {
            //    已经关联到套餐，抛出一个异常
            throw new CustomException("当前分类关联了套餐，不能删除");
            //return R.error("当前分类关联了套餐，不能删除");
        }

        //    正常删除分类
        this.removeById(id);
        //return R.success("删除成功");
    }
}